An atom has an atomic number of 12 and a mass number of 25. How many neutrons does the atom have?

12

13

25

37

What is the density of an object if it has a mass of 73 grams and a volume of 3.8cm3?

Why does the pressure inside a container of gas increase if more gas is added into the container?

What do you think is the importance of networking.

The winner of the 20 km race ran at an average speed of 4 m / s. How long did he take to complete the race?

When two pure substances are combined so that each of the pure substances retains its own properties, what is the result

A living thing that cannot make its own food and must eat other living things for energy

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth? • They are falling toward Earth at the same rate as the space shuttle.

If increase the amplitude how does the velocity change? (No google)

What is the result of multiplying (2.5 * 1010) * (3.5 * 10-7) ? Use the correct number of significant digits.

What is 0.002353 to two significant figures